Classifications

• • C—CHEMISTRY; METALLURGY
  • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
  • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
  • C09J129/00—Adhesives based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by an alcohol, ether, aldehydo, ketonic, acetal, or ketal radical; Adhesives based on hydrolysed polymers of esters of unsaturated alcohols with saturated carboxylic acids; Adhesives based on derivatives of such polymers
  • C09J129/02—Homopolymers or copolymers of unsaturated alcohols
  • C09J129/04—Polyvinyl alcohol; Partially hydrolysed homopolymers or copolymers of esters of unsaturated alcohols with saturated carboxylic acids
• • C—CHEMISTRY; METALLURGY
  • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
  • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
  • C09J7/00—Adhesives in the form of films or foils
  • C09J7/20—Adhesives in the form of films or foils characterised by their carriers
  • C09J7/22—Plastics; Metallised plastics
• • C—CHEMISTRY; METALLURGY
  • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
  • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
  • C09J7/00—Adhesives in the form of films or foils
  • C09J7/30—Adhesives in the form of films or foils characterised by the adhesive composition
  • C09J7/38—Pressure-sensitive adhesives [PSA]
• • C—CHEMISTRY; METALLURGY
  • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
  • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
  • C09J7/00—Adhesives in the form of films or foils
  • C09J7/30—Adhesives in the form of films or foils characterised by the adhesive composition
  • C09J7/38—Pressure-sensitive adhesives [PSA]
  • C09J7/381—Pressure-sensitive adhesives [PSA] based on macromolecular compounds obtained by reactions involving only carbon-to-carbon unsaturated bonds
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F24—HEATING; RANGES; VENTILATING
  • F24S—SOLAR HEAT COLLECTORS; SOLAR HEAT SYSTEMS
  • F24S80/00—Details, accessories or component parts of solar heat collectors not provided for in groups F24S10/00-F24S70/00
  • F24S80/50—Elements for transmitting incoming solar rays and preventing outgoing heat radiation; Transparent coverings
  • F24S80/52—Elements for transmitting incoming solar rays and preventing outgoing heat radiation; Transparent coverings characterised by the material
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
  • C08L2666/00—Composition of polymers characterized by a further compound in the blend, being organic macromolecular compounds, natural resins, waxes or and bituminous materials, non-macromolecular organic substances, inorganic substances or characterized by their function in the composition
  • C08L2666/02—Organic macromolecular compounds, natural resins, waxes or and bituminous materials
  • C08L2666/14—Macromolecular compounds according to C08L59/00 - C08L87/00; Derivatives thereof
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
  • C08L71/00—Compositions of polyethers obtained by reactions forming an ether link in the main chain; Compositions of derivatives of such polymers
  • C08L71/02—Polyalkylene oxides
• • C—CHEMISTRY; METALLURGY
  • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
  • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
  • C09J2301/00—Additional features of adhesives in the form of films or foils
  • C09J2301/40—Additional features of adhesives in the form of films or foils characterized by the presence of essential components
  • C09J2301/414—Additional features of adhesives in the form of films or foils characterized by the presence of essential components presence of a copolymer
• • C—CHEMISTRY; METALLURGY
  • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
  • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
  • C09J2423/00—Presence of polyolefin
• • C—CHEMISTRY; METALLURGY
  • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
  • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
  • C09J2423/00—Presence of polyolefin
  • C09J2423/006—Presence of polyolefin in the substrate
• • C—CHEMISTRY; METALLURGY
  • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
  • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
  • C09J2431/00—Presence of polyvinyl acetate
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F28—HEAT EXCHANGE IN GENERAL
  • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
  • F28F2275/00—Fastening; Joining
  • F28F2275/02—Fastening; Joining by using bonding materials; by embedding elements in particular materials
  • F28F2275/025—Fastening; Joining by using bonding materials; by embedding elements in particular materials by using adhesives
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
  • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
  • Y02E10/00—Energy generation through renewable energy sources
  • Y02E10/40—Solar thermal energy, e.g. solar towers
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
  • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
  • Y10T428/00—Stock material or miscellaneous articles
  • Y10T428/31504—Composite [nonstructural laminate]
  • Y10T428/31855—Of addition polymer from unsaturated monomers
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
  • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
  • Y10T428/00—Stock material or miscellaneous articles
  • Y10T428/31504—Composite [nonstructural laminate]
  • Y10T428/31855—Of addition polymer from unsaturated monomers
  • Y10T428/31909—Next to second addition polymer from unsaturated monomers

Definitions

• the invention relates to a self-adhesive protective film for protecting glass surfaces comprising a porous SiO 2 anti-reflection layer in order to preserve the latter from scratching following production until the eventual use thereof, during storage, transit, and assembly.
• porous SiO 2 anti-reflection layers are their sensitivity in respect of mechanical influences. It therefore makes sense to protect the valuable and sensitive surfaces.
• One solution is represented by self-adhesive films, which are applied following production and remain on the sheet until the solar module is taken into operation. Since some time may elapse between the installation of the solar module and its being taken into operation, a protective article of this kind must be resistant to weathering, so as not to become brittle or to leave adhesive residues behind over a very large area when it is removed.
• a protective film for this purpose does not have to be transparent; indeed, it has advantageously a white pigmentation, since in that way it protects the absorber against overheating, particularly in the case of solar collectors, before the solar module is taken into operation.
• EP 0 519 278 A2 discloses an adhesive applied to a film which is used in turn to protect automobiles.
• the pressure-sensitive adhesive is based on polyisobutylene rubber which has a dynamic elasticity modulus of from 2 ⁇ 10 5 to 7 ⁇ 10 6 dyn/cm 2 , corresponding in Si units to a figure of from 2 ⁇ 10 4 to 70 ⁇ 10 4 Pa, at 60° C.
• the adhesive may further be blended with a silicone oil or with a low molecular mass acrylic polymer.
• DE 196 35 704 A1 describes a self-adhesive surface protective film comprising polyolefins, with a polyethylene-vinyl acetate (EVA) adhesive having a vinyl acetate content of from 40 mol % to 80 mol %, in particular 70 mol %, and having a loss angle tan ⁇ of from 0.6 to 1.0, measured at a temperature of 60° C. and a frequency of 10 ⁇ 2 Hz, and from 0.4 to 0.7, measured at a temperature of 60° C. and a frequency of 10 Hz.
• EVA in the form claimed has good initial adhesion to paint and good paint compatibility.
• window films which alter the properties of the sheets over which they are stuck. They do this, for example, by a darkening tint, IR absorption for heat insulation, or anti-reflection coatings.
• U.S. Pat. No. 5,925,453 A describes for example a window film which reflects light and absorbs IR and can be adhered to the inside of curved auto glass.
• a window film which reflects light and absorbs IR and can be adhered to the inside of curved auto glass.
• support materials which are also miscible with the IR absorbent, preference is given, inter alia, to polyolefins such as polyethylene and polypropylene, polyvinyl chloride, and polyesters such as polyethylene terephthalate and polybutylene terephthalate.
• Possible adhesives recited are self-adhesive compositions, including synthetic rubbers such as styrene-butadiene rubber, polyisobutylene, styrene block copolymers, and polyethylene-vinyl acetate, and also heat- and moisture-activable compositions.
• synthetic rubbers such as styrene-butadiene rubber, polyisobutylene, styrene block copolymers, and polyethylene-vinyl acetate, and also heat- and moisture-activable compositions.
• the SiO 2 anti-reflection layer has nevertheless undergone an irreversible change. Its optical appearance is virtually the same as that of untreated window glass; in other words, the anti-reflection effect has decreased sharply.
• Remanent changes in the anti-reflection effect ought to be completely removable with customary household solvents (for example, methylated spirit (ethanol)) without exposing the sensitive porous SiO2 anti-reflection layer to strong mechanical action.
• the invention accordingly provides a self-adhesive protective film for mechanically protecting glass surfaces comprising porous SiO 2 anti-reflection layers, having a film backing and applied to the backing a self-adhesive composition which comprises at least one copolymer of ethylene and vinyl acetate, the amount of vinyl acetate in the polyethylene-vinyl acetate being preferably at least 40% by weight, more preferably from 55 to 70% by weight, and has been additived with polyalkylene glycols.
• the additive penetrates preferentially into the pores of the porous SiO 2 anti-reflection layer, so that none of the constituents of the adhesive are able to enter the pores, and can be removed straightforwardly and without residue from the pores of the, porous SiO 2 anti-reflection layer using customary household solvents, ethanol for example.
• the formulation of the self-adhesive composition comprises a base polymer of polyethylene-vinyl acetate (EVA) having a vinyl acetate fraction of from 40 to 80% by weight and a melt index MFI in accordance with ISO 1133 (A/4) of from 0.5 to 25 g/10 min at 190° C. and 2.16 kg which has been blended with a polyether having a fraction of from 1 to 35% by weight of the form
• EVA polyethylene-vinyl acetate
• M w 200 to 100 000 g/mol
• the adhesive composition is made up as follows:
• EVA from 65 to 98% by weight, preferably from 75 to 95% by weight EVA, it being possible for the EVA to have in particular a VA fraction of from 40 to 80% by weight, preferably from 50 to 65% by weight, and a melt index MFI of from 0.5 to 25 g/10 min at 190° C. and 2.16 kg, preferably from 1 to 5 g/10 min at 190° C. and 2.16 kg, or mixtures of different EVA grades within these ranges, and
• the adhesive composition is composed of polyethylene-vinyl acetate having a VA fraction of from 40 to 80% by weight, preferably from 45% to 70% by weight, and an addition of (1) or (2) of from 0 to 35% by weight, preferably from 0 to 20% by weight.
• polyalkylene glycols polyglycols, polyglycol ethers
• polyglycols polyglycol ethers
• the skilled worker understands predominantly linear but in part also branched polyethers of the general formula
• polyalkylene glycols can also be obtained as block copolymers of the type
• the self-adhesive composition is advantageously additived with polybutylene glycol and/or polypropylene glycol, in particular at from 5 to 20% by weight (based on the self-adhesive composition), very preferably at from 8 to 15% by weight (based on the self-adhesive composition).
• Polyethylene glycols (polyethylene oxides) is the name for polyalkylene glycols which belong to the class of the polyethers and have the general formula
• Polyethylene glycols are prepared industrially by anionic ring-opening polymerization of ethylene oxide (oxirane) usually in the presence of small amounts of water.
• Liquid products having molar masses ⁇ approximately 25 000 g/mol are termed actual polyethylene glycols, abbreviation PEG, while the higher molecular mass solids (melting point approximately 65° C.) are called polyethylene oxides, abbreviation PEOX.
• High molecular mass polyethylene oxides possess an extremely low concentration of reactive hydroxyl endgroups and therefore exhibit only weak glycol properties.
• Branched polyadducts of ethylene glycol with polyhydric alcohols are also termed polyethylene glycols.
• PPG Polypropylene glycols
• MR 250-4000 whose low molecular mass representatives are miscible with water, whereas the high molecular mass polypropylene glycols, in contrast, are virtually insoluble in water.
• Very high molecular mass polypropylene glycols are referred to as polypropylene oxides.
• the polypropylene glycol come about by ring-opening polymerization of propylene oxide. As glycol ethers in the wider sense they are counted among the polyethers. The simplest representatives of the polypropylene glycols are di-, tri-, and tetrapropylene glycol.
• Suitable backings include very especially unoriented films, which have sufficient flexibility to be able to be bonded to curved surfaces almost without creases.
• Particularly suitable polymers include polyethylene, polypropylene, propylene-ethylene copolymers or mixtures of such.
• the amount of the light stabilizers should be at least 0.15%, preferably at least 0.30%, by weight based on the backing film.
• the thickness of the primer is in particular from 5 to 20 ⁇ m, preferably from 5 to 15 ⁇ m.
• a corona pretreatment as well is effective when coating is carried out from solution.
• the primer is coextruded with the backing layer.
• the self-adhesive composition may for the purpose of greater ease of unwind, particularly of very wide protective films in rolled-up form of up to 2 m in width, for there to be an additional release coating, whose active ingredients may be, for example, silicones or waxes. Otherwise, during the unrolling of the film, which is deliberately of stretchable design, there may already be irreversible distortion.
• the self-adhesive composition is applied to the film preferably in a coatweight of from 8 to 50 g/m 2 , more preferably from 10 to 30 g/m 2 . This ensures a sufficient cushion of adhesive to flow out flush and exhibits the best compatibility with sensitive surfaces, without residues of adhesive.
• the outstanding properties of the self-adhesive protective film permit its use on glass surfaces comprising a porous SiO 2 anti-reflection layer, in a particularly outstanding way.
• the concept of the inventions then, likewise embraces a self-adhesive composition which comprises at least one copolymer of ethylene and vinyl acetate, the amount of vinyl acetate in the polyethylene-vinyl acetate being preferably at least 40% by weight, more preferably from 55 to 70% by weight, and has been additived with polyalkylene glycols.
• the self-adhesive formulation comprises in particular a base polymer of polyethylene-vinyl acetate (EVA) having a vinyl acetate fraction of from 40 to 80% by weight and a melt index MFI in accordance with ISO 1133 (A/4) of from 0.5 to 25 g/10 min at 190° C. and 2.16 kg which has been blended with a polyether having a fraction of from 1 to 35% by weight of the form
• EVA polyethylene-vinyl acetate
• composition of the adhesive is as follows:
• EVA from 65 to 98% by weight, preferably from 75 to 95% by weight EVA, it being possible for the EVA to have in particular a VA fraction of from 40 to 30% by weight, preferably from 50 to 65% by weight, and a melt index MFI of from 0.5 to 25 g/10 min at 190° C. and 2.16 kg, preferably from 1 to 5 g/10 min at 190° C. and 2.16 kg, or mixtures of different EVA grades within these ranges, and
• the EVA in the form described constitutes the polymer framework of the adhesive, with a moderately pronounced tack on polished or glossy metal, plastic, glass, and paint surfaces and a rapidly increasing bond strength thereto which takes on its ultimate level within a few days or more quickly under the effect of heat.
• the polymer skeleton is chemically uncrosslinked and on account of its monomer ratio has only a very low level of crystallinity, the molecular weight, which correlates directly with the MFI, occupies a critical position in terms of the cohesiveness of the adhesive.
• An MFI of from 1 to 5 is considered a favorable figure.
• polyethers described has the effect of reducing the bond strength while retaining the required initial tack, ageing stability, health and environmental safety, lack of staining even of white substrates, and lack of residue on the overstuck surfaces after demasking.
• different molar masses are found suitable for preventing migration and in tandem therewith a swelling, particularly of plastic and paint surfaces.
• the adhesive tape can easily be peeled from the porous SiO 2 anti-reflection layer even after months of outdoor exposure and the deposit which remains can be removed completely using simple means.
• All of the example films were produced by coating a corona-pretreated polyethylene backing 60 ⁇ m thick (composed of 90 percent by weight HDPE with a melt flow rate at 190° C./2.16 kg (ISO 1133) of 0.2 g/10 min, 9.7 percent by weight titanium dioxide, and 0.3 percent by weight Tinuvin 770, Ciba-Geigy) with the solutions of the individual adhesive formulas.
• the thickness of the coat of pressure sensitive adhesive after drying was in each case 20 ⁇ m, giving the specimens an overall thickness of 80 ⁇ m.
• test adhesion substrate use was made of glass plates coated on both sides with a porous SiO 2 anti-reflection layer applied in analogy to the method described in DE 199 18 811 A1.
• the reaction temperature was 800° C.
• the glass sample coated on one side for reference purposes was obtained by masking one side of the immersed sheet with a protective film which was peeled away together with the adhering sol prior to the high-temperature treatment.

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• Chemical & Material Sciences (AREA)
• Organic Chemistry (AREA)
• Engineering & Computer Science (AREA)
• Sustainable Energy (AREA)
• Life Sciences & Earth Sciences (AREA)
• Sustainable Development (AREA)
• Physics & Mathematics (AREA)
• Thermal Sciences (AREA)
• Combustion & Propulsion (AREA)
• Mechanical Engineering (AREA)
• General Engineering & Computer Science (AREA)
• Chemical Kinetics & Catalysis (AREA)
• Adhesives Or Adhesive Processes (AREA)
• Adhesive Tapes (AREA)
• Laminated Bodies (AREA)

Applications Claiming Priority (3)

Publications (1)

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Cited By (3)

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Citations (5)

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• 2001
  • 2001-05-17 DE DE10123985A patent/DE10123985A1/de not_active Withdrawn
• 2002
  • 2002-04-18 US US10/477,659 patent/US20040234799A1/en not_active Abandoned
  • 2002-04-18 EP EP02726243A patent/EP1395637A2/de not_active Withdrawn
  • 2002-04-18 WO PCT/EP2002/004283 patent/WO2002092709A2/de not_active Application Discontinuation
  • 2002-04-18 JP JP2002589580A patent/JP2004531412A/ja active Pending

Patent Citations (5)

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